Medieval Art: Characteristics and Influences
The Morgan Library & Museum: Medieval & Renaissance Manuscripts
The British Library: Medieval Manuscripts Blog
The British Library: Digital Manuscripts
Victoria & Albert Museum: Medieval Collections
The MET: Medieval Art from Private Collections
Philadelphia Museum of Art: Medieval Marvels
The International Center of Medieval Art (ICMA), New York - preserving visual and material cultures produced primarily between ca. 300 CE and ca. 1500 CE in every corner of the medieval world.
Image: Chapelet de virginite, France, ca.1475, The Morgan Library & Museum (https://www.themorgan.org/manuscript/76787)
Image: Christ's descent into hell, Chora Monstery, Constantinople, 14th century